Why Every Aquarium Needs Smart Plugs

The Case for Smart Plugs

Most aquarium equipment — lights, heaters, air pumps, dosing pumps — runs on simple timers. A $12 smart plug replaces mechanical timers with app control, scheduling, energy monitoring, and automation triggers.

The killer feature: power failure alerts. If your heater or filter loses power at 2 AM, a smart plug can send a push notification to your phone. Without it, you might not notice until morning — and by then, your fish could be in trouble.

What to Automate

Lighting (Priority: High)

Your tank lights should run on a consistent schedule. Fish and plants need a regular photoperiod — typically 8-10 hours of light per day. Smart plugs let you:

• Set exact on/off times
• Create sunrise/sunset ramping (with dimmable lights)
• Adjust schedules seasonally
• Enable "movie mode" — dim or kill tank lights while watching TV

Air Pumps (Priority: Medium)

Some fishkeepers run air pumps on schedules — on at night when plants aren't producing oxygen, off during the day. A smart plug makes this effortless.

Dosing Pumps (Priority: High)

Fertilizer dosing for planted tanks or supplement dosing for reef tanks should happen on a strict schedule. A smart plug powering a dosing pump gives you precise control.

Heaters (Priority: High for Monitoring)

You probably want your heater running 24/7 (the built-in thermostat handles cycling). But a smart plug with energy monitoring lets you:

• Detect heater failure (power draw drops to zero)
• Detect stuck-on heaters (power draw never cycles off)
• Monitor energy costs

Recommended Smart Plugs

For Most Equipment: Tuya WiFi Smart Plugs

• Cheap ($5-8 each)
• Works with Home Assistant, Alexa, Google Home
• Individual outlet control on power strips
• Energy monitoring on some models

For High-Draw Equipment: Shelly Plus Plug S

• Handles up to 12A (heaters, canister filters)
• Built-in energy monitoring
• Local API (no cloud dependency)
• Compact design doesn't block adjacent outlets

For Hardwired Equipment: Shelly Plus 1PM Mini

• Wires inline behind an outlet or in a junction box
• Perfect for hardwired pumps or permanent installations
• Power monitoring included

Setting Up with Home Assistant

Once your plugs are connected to Home Assistant, you can create powerful automations:

automation:
  - alias: "Tank lights on at sunrise"
    trigger:
      - platform: sun
        event: sunrise
        offset: "+01:00:00"
    action:
      - service: switch.turn_on
        target:
          entity_id: switch.tank_light

automation:
  - alias: "Alert on heater failure"
    trigger:
      - platform: numeric_state
        entity_id: sensor.heater_plug_power
        below: 1
        for:
          minutes: 30
    condition:
      - condition: numeric_state
        entity_id: sensor.tank_temperature
        below: 76
    action:
      - service: notify.mobile_app
        data:
          title: "Heater Alert"
          message: "Tank heater appears to have failed. Current temp: {{ states('sensor.tank_temperature') }}°F"

The Bottom Line

For under $50, you can automate your entire tank and get alerts that could save your fish. It's the best ROI upgrade in the hobby.

Check out our Automation Guide for the full setup walkthrough.